Ricerc@Sapienza

A class-AB OTA (operational transconductance amplifier) topology
with rail-to-rail input common-mode range is proposed for application
in very low-voltage applications. High efficiency is achieved by
reusing transistors both for class-AB operation and for mirroring the
output currents, and a threshold lowering technique is applied to
allow supply voltages less than two threshold voltages. Simulations
in 40 nm CMOS technology show 41 dB gain at ±0.3 V supply
voltage, a unity-gain frequency of 8.8 MHz on a 5 pF load, class-AB

An innovative low-voltage low-power complementary metal-oxide-semiconductor (CMOS) gain boosting approach is presented. It exploits complementary gate-driven gain boosting and adopts forward body bias, resulting in the minimum possible supply requirement of one threshold plus two saturation voltages, without requiring any additional current branch. The solution is also exploited in a rail-to-rail high-performance single-stage cascode operational transconductance amplifier (OTA).